TCP SYN (p0f)

6:45+19:0:1432:mss*45,10:mss,sok,ts,nop,ws:flow:0

first seen 2026-07-01 15:07 · last seen 2026-10-09 01:48 · JSON

Distinct clients per day (last 30 days, peak 1/day)

Distinct clients are counted by IP-hash per complete UTC day — unlike observation counts this is insensitive to one chatty client, but NAT merges clients and address rotation splits them.

Decomposed attributes

IP version6
Initial TTL45+19
Options length0
MSS1432
Window sizemss*45
Window scale10
Options layoutmss,sok,ts,nop,ws
Quirksflow
Payload class0

Co-observed signals

Signals from other families seen in the same observation. A fingerprint spread thinly across many lower-layer signatures is a classic inconsistency signal.

TLS ClientHello (JA4)

fingerprintco-occurrences
t13d3013h2_1d37bd780c83_8537cf56674e Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.18.0.The fingerprint page shows the full measured match list. More on the catalog.1
t13d2014h2_a09f3c656075_14788d8d241b1
t13d1514h2_8daaf6152771_53a6d0ab1c421
t13d1515h2_8daaf6152771_a54fffd0eb611

HTTP request (JA4H)

fingerprintco-occurrences
ge20nr11enus_187a9385d229_000000000000_0000000000001
ge20nr12enus_a72b71f519fc_000000000000_0000000000001
ge20nn030000_e057572924c3_000000000000_0000000000001
ge20nr020000_b89ce445e0b3_000000000000_0000000000001

HTTP/2 frames (Akamai)

fingerprintco-occurrences
3:100;4:65536;2:0|1048510465|0|m,s,a,p Match?Exact match in Thumbprint's published controlled catalog captures: curl 8.13.0, curl 8.18.0, curl 8.21.0, +8 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:42|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 154.0, firefox 152.0.5, firefox 152.0.1, +3 more.The fingerprint page shows the full measured match list. More on the catalog.1
1:65536;2:0;4:131072;5:16384|12517377|3:0:0:22|m,p,a,s Match?Exact match in Thumbprint's published controlled catalog captures: firefox 153.0, firefox 153.0.3, firefox 155.0.1, +32 more.The fingerprint page shows the full measured match list. More on the catalog.1
2:0;4:4194304;5:16384;6:262144;1:65536|1073741824|0|a,m,p,s1

TCP SYN (JA4T)

fingerprintco-occurrences
64440_2-4-8-1-3_1432_103
64800_2-4-8-1-3_1432_101

User-Agent

fingerprintco-occurrences
Mozilla/5.0 (X11; Linux x86_64; rv:151.0) Gecko/20100101 Firefox/151.02
Go-http-client/2.01
Mozilla/5.0 (compatible; clatter.el)1

Country

fingerprintco-occurrences
DE · Germany2
TR · Turkey1
JO · Jordan1

Network (ASN)

fingerprintco-occurrences
AS8881 · 1&1 Versatel GmbH2
AS12735 · TurkNet Iletisim Hizmetleri A.S.1
AS8376 · Jordan Data Communications Company LLC1